Humans are built for relationship -- relationship with God, and relationship with their fellow man. The beginning of this process, and the training ground for all relationships is the family, primarily with the parents. If you rejected intimacy with your parents, or they were unable to provide you with an environment were intimacy was safe, or they weren't there for you to be intimate with, there is a good chance you will struggle with issues of lust, rejection, bitterness and other sexual and emotional issues.

For example, if you did not have a good relationship with your mother, you probably have looked to other women to fill that need. Since genuine intimacy wasn't modeled to you, it is quite likely that you fill that need in an unhealthy, lustful way. God can set you free from these bondages, but it is important to understand the root cause of this sin, as well as its manifestations.

The root cause is a lack of intimacy. Ultimately, we all crave intimacy with our creator, who made us for relationship with Him. We also enjoy intimacy with our family and close friends. But without proper grounding, it can be very difficult to be transparent and vulnerable enough to build such open relationships.